DoorStop X Firewall
The 2.4 version of DoorStop X Firewall for Mac is provided as a free download on our website. The software lies within Security Tools, more precisely Mac protection. This software for Mac OS X was originally created by Open Door Networks, Inc. This app's bundle is identified as com.opendoor.doorstopx. The application's installer is commonly called DoorStopX2.3.dmg. The most popular versions among DoorStop X Firewall for Mac users are 2.4 and 2.3.
From the developer:
All TCP services protected by default.
Ability to tune protection on a service-by-service and address-by-address basis.
Protect services by name or port number(s).
Default protection setting which applies to all unspecified services.
Four protection modes: deny all, allow all, allow by address, deny by address.
Setup assistant to help you best secure your Mac's services.
You may want to check out more software for Mac, such as WaterRoof, NoobProof or Proxifier, which might be related to DoorStop X Firewall.